/*
 * ProGuard -- shrinking, optimization, obfuscation, and preverification of Java bytecode.
 *
 * Copyright (c) 2002-2018 GuardSquare NV
 *
 * This program is free software; you can redistribute it and/or modify it under the terms of the GNU General Public
 * License as published by the Free Software Foundation; either version 2 of the License, or (at your option) any later
 * version.
 *
 * This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied
 * warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License along with this program; if not, write to the Free
 * Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
 */
package proguard.classfile.editor;

import proguard.classfile.attribute.*;
import proguard.util.ArrayUtil;

/**
 * This class can add/remove bootstrap methods to/from a given inner classes attribute. Inner classes to be added must
 * have been filled out beforehand.
 *
 * @author Thomas Neidhart
 */
public class InnerClassesAttributeEditor {
    private InnerClassesAttribute targetInnerClassesAttribute;

    /**
     * Creates a new InnerClassesAttributeEditor that will edit inner classes in the given inner classes attribute.
     */
    public InnerClassesAttributeEditor(InnerClassesAttribute targetInnerClassesAttribute) {
        this.targetInnerClassesAttribute = targetInnerClassesAttribute;
    }

    /**
     * Adds a given inner class to the inner classes attribute.
     * 
     * @return the index of the inner class.
     */
    public int addInnerClassesInfo(InnerClassesInfo innerClassesInfo) {
        targetInnerClassesAttribute.classes = ArrayUtil.add(targetInnerClassesAttribute.classes,
            targetInnerClassesAttribute.u2classesCount, innerClassesInfo);

        return targetInnerClassesAttribute.u2classesCount++;
    }

    /**
     * Removes the given inner class from the inner classes attribute.
     */
    public void removeInnerClassesInfo(InnerClassesInfo innerClassesInfo) {
        ArrayUtil.remove(targetInnerClassesAttribute.classes, targetInnerClassesAttribute.u2classesCount--,
            findInnerClassesInfoIndex(innerClassesInfo));
    }

    /**
     * Finds the index of the given bootstrap method info in the target attribute.
     */
    private int findInnerClassesInfoIndex(InnerClassesInfo innerClassesInfo) {
        int innerClassesCount = targetInnerClassesAttribute.u2classesCount;
        InnerClassesInfo[] innerClassesInfos = targetInnerClassesAttribute.classes;

        for (int index = 0; index < innerClassesCount; index++) {
            if (innerClassesInfos[index].equals(innerClassesInfo)) {
                return index;
            }
        }

        return innerClassesCount;
    }

}